Textile drawing roll



Patented Feb. 5, 1952 TEXTILE DRAWING ROLL Merton W. Taylor, KennebunkBeach, Maine, as-

signor to Saco-Lowell Shops, Boston, Mass., a

corporation of Maine Application August 25, 1950, Serial No. 181,340

This invention relates to textile drawing rolls. such as are commonlyused in spinning, roving and other similar textile machines, and moreparticularly to a coupling for the sections of such rolls.

Textile drawing rolls are built up to a desired length by, joiningsuccessive sections together, and are frequently as much as forty feetor more in total length. The accuracy and uniformity with which suchrolls are made has a definite effect on the quality of the yarnproduced, particularly in the modern high-draft systems, since anyeccentricity or runout of the rolls will cause varying conditions whichundesirably affect the drafting and thus the uniformity of the sliverbeing drafted. To reduce such eccentricity or runout and produce a rollof sufficient straightness for use in modern high draft systems requiresa considerable amount of straightening.

The screw joint for the sections of textile drawing rolls is practicallyin universal use today. The internal part of the joint has an accuratelybored hole, followed by a conventional internal thread. The mating parthas a conventional thread followed by a cylindrical por tion that fitstightly in said accurately bored hole,

the cylindrical portion being pulled tightly into place by the screwthread. It is diflicult, how ever, to tap an internal thread and havethe axis of the thread in line with the axis of the roll section withany degree of accuracy, thus, after assembling a screw joint of theconventional type. during the required straightening operation a veryhigh stress is set up in the screw due to the bending of the male threadtrying to aline itself with the mis-alined female thread. Such conditionproduces an excessive bend in the roll at the joint, requiringconsiderable straightening of the final length of the roll in order toobtain a usable roll, and an even greater amount in order to produce aroll straight enough for use with modern high draft systems.

The object of my invention is to eliminate or greatly reduce the abovementioned stress, thus eliminating or greatly reducing the amount ofnecessary straightening and producing a more accurate textile drawingroll which is particularly suitable for use with modern high draftsystems in which an accurate drawing roll is essential.

Apreferred form of my invention is shown in the drawing, in which:

Fig. 1' is a side elevation of a portion of a textile drawing roll,partly in section, embodying my invention;

Fig. 2 is aside elevation of a portion of a textile drawing roll, partlyinsection, embodying a modified form of my invention; and

Fig. 3 is a side elevation of a portion of a textile drawing roll,mostly in section, embodying still another modified form of myinvention.

Referring to Fig. l, I have shown end portions of a pair of drawing rollsections, generally indi- 4 Claims. (01. 19141) cated at I2 and I4,adapted to be assembled with other similar sections to build up adrawing roll of any desired length. The drawing roll section I2 isprovided with an axially alined recess in one end thereof, said recesshaving a smooth portion I 6 adjacent the end of said section I2. Thesmooth portion I6 may be either slightly tapered, as shown, or ofcylindrical shape as may be de sired. An inner threaded portion It! isprovided in said recess adjacent said smooth portion I6, said innerthreaded portion having threads formed in a substantially cylindricalbored hole as is conventional. The roll section I4 has an axially alinedmale threaded portion 25 adjacent the end thereof, and an inner smoothportion 24 adapted to fit closely into smooth portion It on roll sectionI2. The threaded portion 26 has threads formed on a tapered cylindricalsurface, the diameter of said threaded portion 26 being greater at theend of roll section I4 (the left end as shown in Fig. 1) than at the endof said threaded portion 26 adjacent the smooth portion 24, thusproducing a back taper on said threaded portion 26, the larger diameterof said threaded portion 26 being adapted to fit closely into threadedportion I8 on roll section I 2.

When roll sections I2 and I4 are assembled by screwing the threadedportion 26 of roll section I 4 into the threaded portion I8 of rollsection I2, the accurately fitting smooth portions I 6 and 24 will actto aline the roll sections I2 and I4, while the tapered threaded portion26 of roll section I4 and the threaded portion I8 of roll section I2will retain the roll sections in closely adjacent assembled relation.The tapered threaded portion 26 and the internally threaded portion I8have substantially greater clearance on the diameter at the end adjacentthe smooth portions I6 and 24 than at the other end, thus the closelyfitting smooth portions will aline the roll sections, while theclearance between said threaded portions adjacent said smooth portionswill allow such alinement without setting up high stresses in the joint,since the clearance allows the bend of the threaded portion 26 to bedistributed over the major portion of the,

length of said threaded portion. I prefer that the clearance on thediameter be between 0.005 and 0.05 inch per inch of length, and withinsuch range preferably about 0.01 inch per inch of length, since suchtaper is great enough to allow alinement but still leaves a considerableportion of the threads of roll section I4 in position to be gripped bythe threads of roll section !2, though obviously a greater or lesserdegree of taper may be used without departing from the spirit of myinvention.

In order to provide a means for predetermining the lengths of thefinished roll, roll sections I2 and It may be provided with opposingshoulders 28 and 30 respectively, said shoulders abutting when the rollsections I 2 and I4 are assufiicient taper to similarly provide ameansfor predetermining the length of the finished roll. The clearancebetween the threaded portions of the roll sections may also be providedby tapering the female threaded portion of the recess in roll section l2as shown in Fig, 2. In this modification of my invention, in whichcorresponding parts have been numbered similarly to Fig. 1, the rollsection I? is provided with an axially alined recess having a' smoothportion 161" adjacent the. end; of said section [2. An, inner threadedportion 32 is provided in said recess. adjacent the. smooth portion It,said female threaded portion, 32 being tapered, with the larger.diameter of said threaded portion; 32 adjacent the smooth portion 6.

The adjoining roll section M- has antaxialli alined threaded; portion 34adjacent: the. end

thereof, and inner-smooth portion is adjaeg;

centsaid threaded portion. The male threaded portion at has straightthreads of: uniform" diameter adapted to fit, intothe minimum diameterof thetaper-threaded'portion 32, so that,

when roll-section M is screwed into the tapered 1 threaded portion 32 ofroll-section i2, a clear-= ance is thuszprovidedat the end ofsaidthreadecl f' pered as to provide a clearance adjacent the smoothaliningportions of the roll joint while at the same time providing thenecessary grip to. retain the roll sections in closely adjacentassembled relation.

In Fig. 3 I have shown a still further-modification of my invention, inwhich two similar roll sections I2. are coupled by-a bearingsection 35;said bearing section being provided at each end with a shoulder 38*adapted to. fit against shoulder 290i roll section t2; a smooth portionMl adapted. to fit the smooth portion iii of the roll section t2, and athreaded portion I 42; shown as a back tapered thread similar tothreaded portion 26 of Fig. 1, though of course the means of Fig. 2maybeemployed. Such back tapered thread 42- is adapted'to fit into theinternally threaded-portion it of roll section l2 as hereinbeforeexplained. By such an arrangement I am enabled to replace roll sectionsas they become worn, without any change in the length of the finishedroll, and with little or no required straightening of the roll afterreplacing such bearing section; since my novel roll coupling and'alininmeans greatly reduces the stress at such roll joint.

It will'be understood'from the above description that various expedientsmaybe resorted to in order to provide clearance between thetaperedportions adjacent the straight alining portions whichcharacterize my novel textile drawing roll, and I do not Wish to beunderstood as limiting my invention to the details disclosed, except asset forth in the appended claims;

I claim:

1. In a textile drawing roll having a plurality of roll sections;coupling means for said sections including anaxially alined recesshaving an internally threaded portion in one of said sections and anaxially alined externally threaded portion on an adjacent sectionadapted to;be retained by said internally threaded portion on said firstsection, said threaded portions having substantially greater clearanceat the end adjacent the end of said first section than at the end awayfrom the end or" said first section, whereby the sections of said rollare easily alined.

2. In a textile drawing roll having a plurality of roll sections; meanspredetermining the length of said drawing roll, coupling means for saidsections including an axially alined recess in one of said sectionshaving an internally threaded portion, and an axially'alined' memher onan adjacent section having an externally threaded portion adapted to beretained by" said internally threaded portion on said first section,said threaded portions having substantially greater clearance at the endadjacent the end of said first sectionthan at the end'away from the endof said first section, whereby the sections of said roll are easilyalined.

3. In a textile drawing roll having a plurality of roll sections;alining and coupling. means for said sections including an axiallyalined recess in one of said sections having a smooth portion adjacentthe end of said' section and an internally threaded portion adjacentsaid smooth portion; an axially alined? externally threaded portion onan adjoining second section adjacent the end" thereof adapted to beretained by said internally threaded portion, and an axially alined"smooth portion on said second section adjacent said externally threadedportion closely fitting the smooth portion of said first section, saidthreaded'portions having substantially greater clearance at the end ad'-jacent said smooth portions than at the end away from said smoothportions, whereby said sections are easily alined by said smoothportions.

4. In a textile drawing roll having a plurality of roll sections; meanspredetermining the length of said drawing roll; alining and couplingmeans for said sections including an axially alined recess in one ofsaidsections having a smooth portion adjacent the end of said section and aninternally threaded portion adjacent said smooth portion, and an axiallyalined externally threaded" portion on an adjoining second sectionadjacent the endthereof adapted to be retained by said internallythreaded portion, and an axially alined smooth portion on said secondsection adjacent said externally threaded portion clbsely fitting thesmooth portion of said first section, said threaded portionshavingsubstantially greater clearance at the end" adjacent said smoothportions than at the end away from sai'd smooth portions, whereby saidsections are easily alined by said smooth portions;

MERTON WT TAYLOR.

REFERENCES CITED:

The following references are of record in the file of this patent:

